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양극산화법에 의한 다공성 SnO<sub>2</sub> 피막
한혜정,최재호,민석홍,Han, Hye-Jeong,Choi, Jae-Ho,Min, Seok-Hong 한국재료학회 2006 한국재료학회지 Vol.16 No.8
The measurement of specific gases is based on the reversible conductivity change of sensing materials in semiconductor type gas sensors. For an application as gas sensors of high sensitivity, porous $SnO_2$ films have been fabricated by anodizing of pure Sn foil in oxalic acid and characteristics of anodic tin oxide films have been investigated. Pore diameter and distribution were dependent on process conditions such as electrolyte concentration, applied voltage, anodizing temperature, and time. Characteristics of anodic films were explained with current density-time curves.
한혜정(Hye-Jeong Han),이해준(Hae-June Lee),강성수(Seong-Soo Kang),이수한(Soo-Han Lee),조익현(Ick-Hyun Cho),이종환(Jong-Hwan Lee),나승열(Seung-Yeol Nah),박창현(Chang-Hyun Park),엄창섭(Chang-Sub Uhm),배춘식(Chun-Sik Bae) 고려인삼학회 2003 Journal of Ginseng Research Vol.27 No.3
We investigated the effect of ginseng total saponin (GTS) on the regeneration process of experimentally crush injured rat sciatic nerves. The bilateral sciatic nerves of fifty adult male Sprague-Dawley rats were compressed surgically with a straight hemostat for 30 seconds with 1 mm width. Twenty rats were divided into four groups to test the dosedependent effect of GTS (0, 50, 100, or 150 mg/kg, i.p.). Saline for vehicle control group or GTS dissolved in saline was administerd for three weeks. After that period of time, the numbers of total myelinated axon and degenerated myelin in<br/> the sciatic nerves of bilateral legs were examined and analyzed using image analysis system to confirm a morphological effect of GTS. We found that the most effective concentration of GTS for the regeneration of damaged sciatic nerve was 150 mg/kg. In another set of experiment, thirty rats were divided into two groups as saline-treated vehicle group and GTStreated group (150 mg/kg, i.p.) for three weeks. Every week we examined the numbers of total myelinated axon and degenerated myelin in the sciatic nerves of bilateral legs using image analysis system to evaluate the effect of GTS on<br/> injured nerves. We found that the regeneration of damaged sciatic nerves was facilitated in GTS-treated group compared to saline-treated group until two weeks. However, after that period of time we could not observe the significant difference between saline-treated group and GTS-treated group. These results suggest that GTS is a useful adjuvant therapy for the regeneration of the peripheral nerve injury in short period of treatment.
한혜정 ( Hye Jeong Han ),윤주환 ( Zu Whan Yun ) 한국물환경학회 ( 구 한국수질보전학회 ) 2006 한국물환경학회지 Vol.22 No.3
A sequencing batch biofilm reactor (SBBR) operated with a cycle of anaerobic - aerobic - anoxic - aerobic has been evaluated for the nutrient removal characteristics. The sponge-like moving media was filled to about 10% of reactor volume. The sewage was the major substrate while external synthetic carbon substrate was added to the anoxic stage to enhance the nitrogen removal. The operational results indicated that maximum T-N and T-P removal efficiencies were 97% and 94%, respectively were achieved, while COD removal of 92%. The observations of significant nitrogen removal in the first aerobic stage indicated that nitrogen removal behaviour in this SBBR was different to conventional SBR. Although the reasons for aerobic nitrogen removal has speculated to either simultaneous nitrification and denitrification or anoxic denitrification inside of the media, further researches are required to confirm the observation. The specific oxygen uptake rate (SOUR) test with biofilm and suspended growth sludge indicated that biofilm in SBBR played a major role to remove substrates.
특허(特許)로 본 폐망간전지 재활용(再活用) 기술(技術) 동향(動向)
손정수,강경석,한혜정,김태현,신선명,Shon, Jeong-Soo,Kang, Kyung-Seok,Han, Hye-Jung,Kim, Tae-Hyun,Shin, Shun-Myung 한국자원리싸이클링학회 2008 資源 리싸이클링 Vol.17 No.2
There are several kinds of battery such as zinc-air battery, lithium battery, manganese dry battery, silver oxide battery, mercury battery, sodium-sulphur battery, lead battery, nickel-hydrogen secondary battery, nickel-cadmium battery, lithium ion battery and alkaline battery, etc. These days it has been widely studied for the recycling technologies of the used battery from view points of economy and efficiency. In this paper, patents on the recycling technologies of the used manganese dry battery were analyzed. The range of search was limited in the open patents of USA (US), European Union (EP), Japan (JP), and Korea (KR) from 1986 to 2006. Patents were collected using key-words searching and filtered by filtering criteria. The trends of the patents were analyzed by the years, countries, companies, and technologies. 배터리는 공기아연 리튬 망간 산화은 수은 나트륨-유황 납축 니켈-수소 이차 니켈-카드뮴 리튬이온 알칼라인 전지 등의 여러 종류가 있다. 경제적, 효율적 관점에서 폐전지의 재활용 기술은 폭넓게 연구되어 왔다. 본 연구에서는 폐망간 전지의 재활용 기술에 대한 특허를 분석하였다. 분석범위는 1986년${\sim}$2006년까지의 미국, 유럽, 일본, 한국의 등록/공개된 특허로 제한하였다. 특허는 키워드를 사용하여 수집하였고, 기술의 정의에 의해 필터링하였다. 특허동향은 연도, 국가, 기업, 기술에 따라 분석하여 나타내 보았다.